PROBLEM TO BE SOLVED: To provide a high-frequency power supply that improves the power efficiency and a magnetic resonance imaging apparatus using such a high-frequency power supply.SOLUTION: A high-frequency power supply 1 amplifies an input signal including an application timing of a high-frequency magnetic field and waveform information, and supplies the amplified input signal to a high-frequency coil, comprising an amplifier 1d and a control unit. The amplifier 1d amplifies the input signal and outputs an amplified signal. The control unit varies power supply voltage used by the amplifier 1d for the amplification of the input signal, in accordance with the magnitude of the input signal. The control unit varies the power supply voltage on a basis of a condition determined based on data obtained by applying a high-frequency magnetic field to a subject.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2020,JPO&INPIT【課題】電力効率を改善する高周波電源及び磁気共鳴イメージング装置を提供する。【解決手段】高周波磁場の印加タイミングと波形の情報とを含む入力信号を増幅し高周波コイルに供給する高周波電源１は、増幅器１ｄと、制御部とを備える。増幅器１ｄは、入力信号を増幅して増幅信号を出力する。制御部は、増幅器１ｄが入力信号の増幅に用いる電源電圧を、入力信号の大きさに応じて変化させる。制御部は、更に被検体に高周波磁場を印加して得られたデータに基づいて決定された条件に基づいて、電源電圧を変化させる。【選択図】図５
